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Locating Gas Supply
The gas line can enter the unit either through the floor or outside
wall. The gas line opening should be made at this time. Location
of the opening will be determined by the position of floor joists
and the valve and union used for servicing.
Recommended Gas Pipe Diameter
Note: Never use plastic pipe. Check to confirm whether your local
codes allow copper tubing or galvanized.
Note: Since some municipalities have additional local codes, it is
always best to consult your local authority and installation code.
The use of the following gas connectors is recommended:
— ANS Z21.24 Appliance Connectors of Corrugated Metal Tubing
and Fittings
— ANS Z21.45 Assembled Flexible Appliance Connectors of
Other Than All-Metal Construction
The above connectors may be used if acceptable by the authority
having jurisdiction. The state of Massachusetts requires that a
flexible appliance connector cannot exceed three feet in length.
GASSUPPLY
TEEHANDLE
FLEXTUBING
NPTNIPPLE
FLAREFITTING
FLARESHUTOFFVALV
E
CLOSENIPPLE
TEEHANDLE
NPTNIPPLE
NPTUNION
SHUTOFFVALVE
NPTGASSUPPL
Y
Figure 1
Consult the current National Fuel Gas Code, ANSI Z223.1 CAN/
CGA-B149 (.1 or .2) installation code.
Installing a New Main Gas Cock
Each appliance should have its own manual gas cock.
A manual main gas cock should be located in the vicinity of
the unit. Where none exists, or where its size or location is not
adequate, contact your local authorized installer for installation
or relocation.
Compounds used on threaded joints of gas piping shall be resistant
to the action of liquefied petroleum gases. The gas lines must be
checked for leaks by the installer. This should be done with a soap
solution watching for bubbles on all exposed connections, and if
unexposed, a pressure test should be made.
Never use an exposed flame to check for leaks. Appliance must
be disconnected from piping at inlet of control valve and pipe
capped or plugged for pressure test. Never pressure test with
appliance connected; control valve will sustain damage!
A gas valve and ground joint union should be installed in the gas
line upstream of the gas control to aid in servicing. It is required by
the National Fuel Gas Code that a drip line be installed near the gas
inlet. This should consist of a vertical length of pipe tee connected
into the gas line that is capped on the bottom in which condensation
and foreign particles may collect.
Figure 2
Method of Installing a Tee Fitting Sediment Trap
Pressure Testing of the Gas Supply System
1. To check the inlet pressure to the gas valve, a 1/8" (3mm) N.P.T.
plugged tapping, accessible for test gauge connection, must be placed
immediately upstream of the gas supply connection to the appliance.
2. The appliance and its individual shutoff valve must be disconnected
from the gas supply piping system during any pressure testing of that
system at test pressures in excess of 1/2 psig (3.5 kPa).
3. The appliance must be isolated from the gas supply piping system by
closing its individual manual shutoff valve during any pressure testing
of the gas supply piping system at test pressures equal to or less than
1/2 psig (3.5 kPa).
Attention! If one of the above procedures results in pressures in excess
of 1/2 psig (14" w.c.) (3.5 kPa) on the appliance gas valve, it will result
in a hazardous condition.
Checking Manifold Pressure
Both Propane and Natural gas valves have a built-in pressure regulator
in the gas valve. Natural gas models will have a manifold pressure of
approximately 4.0" w.c. (.996kPa) at the valve outlet with the inlet pressure
to the valve from a minimum of 5.0" w.c. (1.245kPa) for the purpose of
input adjustment to a maximum of 10.5" w.c. (2.61kPa). Propane gas
models will have a manifold pressure approximately 10.0" w.c. (2.49kPa)
at the valve outlet with the inlet pressure to the valve from a minimum of
11.0" w.c. (2.739kPa) for the purpose of input adjustment to a maximum
of 13.0" w.c. (3.237kPa).
A 1/8" (3mm) N.P.T. plugged tapping, accessible for test gauge connection,
is located on the outlet side of the gas control.
Pipe Length Schedule 40 Pipe
Inside Diameter
Tubing, Type L Out-
side Diameter
Nat. L.P. Nat. L.P.
0-10 Feet
0-3 Meters
1/2"
12.7mm
3/8"
9.5mm
1/2"
12.7mm
3/8"
9.5mm
10-40 Feet
4-12 Meters
1/2"
12.7mm
1/2"
12.7mm
5/8"
15.9mm
1/2"
12.7mm
40-100 Feet
13-30 Meters
1/2"
12.7mm
1/2"
12.7mm
3/4"
19mm
1/2"
12.7mm
100-150 Feet
31-46 Meters
3/4"
19mm
1/2"
12.7mm
7/8"
22.2mm
3/4"
19mm
GAS SUPPLY